Chemistry by OpenStax (2015-05-04)
1st Edition
ISBN:9781938168390
Author:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Publisher:Klaus Theopold, Richard H Langley, Paul Flowers, William R. Robinson, Mark Blaser
Chapter18: Representative Metals, Metalloids, And Nonmetals
Section: Chapter Questions
Problem 78E: Phosphoric acid, one of the acids used in some cola drinks, is produced by the reaction of...
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![Name
Period
Unit 4 Review Worksheet #1
Molar Mass and Percent Composition
Date
Directions: Complete on a separate piece of paper.
1. Calculate the molar mass of each of the following:
a. (NH4)3PO4
b. BaF2
c. CH₂Cl₂
d. Ca(C₂H3O2)2
2. Calculate each of the following quantities:
a. Mass in grams of 0.68 mol KMnO4
b. Mass in kilograms of 4.6 x 1021 molecules of NO₂
c. Moles of Fe(CIO4)3 in a 15.8 kg sample
3. Calculate the number of moles and formula units in 78.9 g of sodium perchlorate.
4. What is the percent composition of each in element in NH4HCO3?
5. What is the percent composition of Mn in KMnO4?
6. Ammonium nitrate is a common fertilizer. Agronomist base the effectiveness of
fertilizers on their nitrogen content. Calculate the mass percent of N in ammonium
nitrate.
7. How many moles are in 15 g of lithium?
8. How many grams are in 88.1 moles of magnesium?
9. How many atoms are in 98.3 grams of aluminum hydroxide?
10. How many carbon dioxide molecules are there in 3.25 moles of carbon dioxide?
11. What is the mass of 3.40 moles of Cu(NO3)2?
12. A chemist determines that 1.26 g of iron reacts with 0.54 g of oxygen to form rust [iron
(III) oxide]. What is the percent composition of each element in the new compound?
13. In an experiment, a student took a 12.2 g sample of table salt and chemically separated
the chlorine from the sodium. He determined that there were 5.2 g of chlorine in the
sample. What is the percent composition of each element in the table salt sample?](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F7c430cc2-4097-4d45-9871-f052d1dcc428%2F392bca8a-232c-4a8a-b847-4f4f55706b3d%2Fdr6qu9o_processed.jpeg&w=3840&q=75)
Transcribed Image Text:Name
Period
Unit 4 Review Worksheet #1
Molar Mass and Percent Composition
Date
Directions: Complete on a separate piece of paper.
1. Calculate the molar mass of each of the following:
a. (NH4)3PO4
b. BaF2
c. CH₂Cl₂
d. Ca(C₂H3O2)2
2. Calculate each of the following quantities:
a. Mass in grams of 0.68 mol KMnO4
b. Mass in kilograms of 4.6 x 1021 molecules of NO₂
c. Moles of Fe(CIO4)3 in a 15.8 kg sample
3. Calculate the number of moles and formula units in 78.9 g of sodium perchlorate.
4. What is the percent composition of each in element in NH4HCO3?
5. What is the percent composition of Mn in KMnO4?
6. Ammonium nitrate is a common fertilizer. Agronomist base the effectiveness of
fertilizers on their nitrogen content. Calculate the mass percent of N in ammonium
nitrate.
7. How many moles are in 15 g of lithium?
8. How many grams are in 88.1 moles of magnesium?
9. How many atoms are in 98.3 grams of aluminum hydroxide?
10. How many carbon dioxide molecules are there in 3.25 moles of carbon dioxide?
11. What is the mass of 3.40 moles of Cu(NO3)2?
12. A chemist determines that 1.26 g of iron reacts with 0.54 g of oxygen to form rust [iron
(III) oxide]. What is the percent composition of each element in the new compound?
13. In an experiment, a student took a 12.2 g sample of table salt and chemically separated
the chlorine from the sodium. He determined that there were 5.2 g of chlorine in the
sample. What is the percent composition of each element in the table salt sample?
Transcribed Image Text:111 and
Name
Period
Date
1/2001-1s (0)-001 + (a) 05 +00 si
Thermochemical Equations Worksheet
1. How much heat is released when 6.44 g of sulfur reacts with excess oxygen according to
the following equation?
2S (s) + 302 (g) → 2SO3 (g) AH--791.4 kJ
(3) M
2. What is the heat change when 4.72 g of carbon reacts with excess oxygen according to
the following equation?
C(s) + O2(g) → CO₂ (g) AH = -393.5 kJ
angenbyd as ditiw saimoidlog 28€ 10897 01 butoon ai sod doum woll 8
Snoitsups gniwollot di of
LI 08.ST-HA (2) 78H (3) 78+ (g) H
3. What is the heat change when 1.48 g of chlorine reacts with excess phosphorus according
to the following equation?
2P (s) + 5Cl2 (g) → 2 PCls (g) AH = -886 kJ
1961 nagorbyd to go.81 nodw leol ai jead doum wol e
Shoitaupe galwollot or
HA (DOHS (g) 0+ (g) (HS
4. How much heat is gained when 5.81 g of carbon reacts with excess hydrogen gas
according to the following equation?
6C (s, graphite) + 3 H2 (g) → C6H6 (g) AH = 49.03 kJ
oxo diw arouon ainomms to g 0.4I now sgasilo teori odatdW 01
noitenps gorwellol sh
WOH-=HA () Oct à (2) 0/
5. What is the heat change when 4.77 g of ethanol reacts with excess oxygen according to
the following equation?
C₂H5OH (g) + 302 (g) → 2CO2 (g) + 3H₂O (g) AH = -1366.7 kJ
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